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The Defense-in-Depth Validation skill provides a structured framework for Claude to harden codebases against invalid data by enforcing rigorous checks across multiple system layers. Rather than relying on a single validation point that could be bypassed by refactoring or mocks, this skill guides the implementation of entry-point validation, business logic verification, environment-specific guards, and debug instrumentation. It is particularly useful for critical operations where data corruption or unintended execution could lead to significant failures, ensuring that every piece of data is verified at every checkpoint it passes through.
